Composite space antenna structures: Properties and environmental effects

The thermal behavior of composite spacecraft antenna reflectors has been investigated with the integrated Composites Analyzer (ICAN) computer code. Parametric studies have been conducted on the face sheets and honeycomb core which constitute the sandwich-type structures. Selected thermal and mechanical properties of the composite faces and sandwich structures are presented graphically as functions of varying fiber volume ratio, temperature, and moisture content. The coefficients of thermal expansion are discussed in detail since these are the critical design parameters. In addition, existing experimental data are presented and compared to the ICAN predictions

Integrating Green Infrastructure Into Stormwater Policy: Reliability, Watershed Management, and Environmental Psychology as Holistic Tools for Success

As cities continue to expand, the issues of flood control and urban water quality have become major modern sustainability challenges. Green infrastructure—the use of nature-based solutions to target, treat, and store stormwater at its source—has emerged as a possible solution. While green infrastructure does offer multiple benefits for urban users, its performance is also highly variable. This Article addresses a key gap in existing literature by explicitly addressing how uncertainty in environmental and anthropogenic factors affects green infrastructure performance and integration within the Clean Water Act’s municipal separate storm sewer (MS4) regulatory program

Scrambling and thermalization in a diffusive quantum many-body system

Out-of-time ordered (OTO) correlation functions describe scrambling of information in correlated quantum matter. They are of particular interest in incoherent quantum systems lacking well defined quasi-particles. Thus far, it is largely elusive how OTO correlators spread in incoherent systems with diffusive transport governed by a few globally conserved quantities. Here, we study the dynamical response of such a system using high-performance matrix-product-operator techniques. Specifically, we consider the non-integrable, one-dimensional Bose-Hubbard model in the incoherent high-temperature regime. Our system exhibits diffusive dynamics in time-ordered correlators of globally conserved quantities, whereas OTO correlators display a ballistic, light-cone spreading of quantum information. The slowest process in the global thermalization of the system is thus diffusive, yet information spreading is not inhibited by such slow dynamics. We furthermore develop an experimentally feasible protocol to overcome some challenges faced by existing proposals and to probe time-ordered and OTO correlation functions. Our study opens new avenues for both the theoretical and experimental exploration of thermalization and information scrambling dynamics.Comment: 7+4 pages, 8+3 figures; streamlined versio

United States Food Law Update: Labeling Contoversies, Biotechnology Litigation, and the Safety of Imporeted Food

This update summarizes significant changes and developments in food law throughout the first half of 2007. Out of necessity, not every change is included; rather, this update is limited to significant changes in national law. This series of updates provides a starting point for scholars, practitioners, food scientists, and policymakers determined to understand the shaping of food law in modern society. Tracing the development of food law through these updates also builds an important historical context for the overall development of the discipline

United States Food Law Update

Michael T. Roberts and Margie Alsbrook noted in the Journal\u27s inaugural Food Law Update that [t]he one constancy about food law in the United States is change, especially in a rapidly-developing food industry. This observation holds true today and also augurs a change in authorship of this section of the Journal. I hope to follow my colleagues\u27 lead and provide timely and cogent updates of the federal (and occasionally state) statutes, regulations, and judicial decisions impacting food law and policy. It is both an honor and a duty, as food and its legal implications remain in many respects the world\u27s most important subject

The Economics of wages and wages policy in the depression and recovery period: distinctive elements in the New Zealand debate, 1931- 1936

This article discusses distinctive features of the New Zealand debate on the economics of wages and wages policy from 1931 up to the restoration of compulsory arbitration in 1936. Local economic orthodoxy proffered advice which, consistent with Keynes (1936), turned on the need for a general real wage reduction effected mostly through currency devaluation, rather than through further money wage cuts. Dissenters were critical of currency devaluation; they stressed excessively generous unemployment relief, real wage 'overhang' and structural real wage distorttons. Tentative estimates of both aggregate real product wage and labour productivity changes demonstrate, prima facie, that at least one strand in the dissenting argument was defensible

United States Food Law Update: Pasteurized Almonds and Country of Origin Labeling

The last six months of 2008 found the nation occupied with a heated presidential election campaign and the transition to a new party\u27s control of the executive branch. The outgoing president, as is often the case in the waning months of an administration\u27s time in office, attempted to finalize several policy initiatives. This version of the Food Law Update will discuss two major developments with significant long-term impact on the law of food: the implementation of mandatory country of origin labeling (COOL) for most unprocessed agricultural commodities; and the increasing use of the United States Department of Agriculture\u27s (USDA) Agricultural Marketing Service to regulate food safety via marketing orders/agreements. Specifically, this update will discuss new rules mandating treatment of raw almonds to reduce the risk of Salmonella bacteria. As an up- (late, this article does not attempt to exhaustively analyze the implications of these developments, but merely to identify and briefly discuss the issues as a departure point for further analysis